| Algol 68 with areas | ⊕ 1972 | ↓ ↑ ⊕ Experimental and other | ⊕ True ALGOL68s | ⊕ United Kingdom | Addition of areas to Algol 68 |
| associons | ⊕ 1972 | ↓ ↑ ⊕ Experimental and other | ⊕ Theoretical incl category based | ⊕ Netherlands | Tuple based programming extensions |
| EASY | ⊕ 1972 | ↓ ↑ ⊕ Experimental and other | ⊕ Intermediate languages and VMs | ⊕ United States | Intermediate language |
| FGRAAL | ⊕ 1972 | ↓ ↑ ⊕ Experimental and other | ⊕ Graph | ⊕ United States | Fortran Graph extensions |
| HARVEY | ⊕ 1972 | ↓ ↑ ⊕ Experimental and other | ⊕ Other Wirth Algols | ⊕ United States | ICR Bliss dialect |
| Hoare super-structured Algol | ⊕ 1972 | ↓ ↑ ⊕ Experimental and other | ⊕ True ALGOL60s | ⊕ United Kingdom | Algol with sets, subsets, orders etc |